| Effect of irrigation at different growth stages on soil water and nitrogen spatial distribution in Hexi spring wheat border field |
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| DOI：10.7606/j.issn.1000-7601.2012.04.01 |
| Key Words: irrigation at different growing stages spring wheat storage efficiency spatial distribution uniformity soil water and nitrogen |
| Author Name | Affiliation | | SUO Yansong | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Fucang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | XUE Fengding | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | WU Lifeng | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | YUAN Yuxia | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The experimental study on spatial distribution and uniformity of soil water and nitrogen was conducted in Hexi spring wheat border field from April to July 2011. Border irrigation, 30 m×3 m, was designed and five points along border length center used for fixed observation were arranged in parts respectively 3 m, 9 m, 15 m, 21 m and 27 m from the head of border. The contents of soil water and nitrate 2 d before and after irrigation were investigated in 0～100 cm soil depths. Meanwhile the spatial variabilities, the storage efficiency in the crop root zone and the uniformity along basin length for soil water and nitrate were evaluated. The results show that, spatial variabilities of the soil water content 2 d before and after irrigation in all treatments at different growing stages are medium. The value of coefficient of variation 2 d before irrigation are higher than that 2 d after irrigation. The spatial variabilities of the soil nitrate (NO3-N) content 2 d before and after irrigation are also medium except those in the treatments of irrigation water consumption of 90 mm and 60 mm at jointing stage are strong. The soil water storage efficiency are not significantly different at various growing stages. There is significant difference between no irrigation and irrigation at mature stage. While the soil nitrate content storage efficiency is significantly different and increases under no irrigation and adverse under irrigation at mature stage. For the uniformity of soil water and nitrate along basin length, the results show no significant difference among all irrigation treatments at different stages. The uniformity of soil water in no irrigation treatment is significantly lower than that in irrigation treatment at mature stage, while the uniformity of soil nitrate has no significant difference in the two treatments at the same stage. |
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